To what extent should we embrace nationalism?

Nationalism has been viewed as both a positive and a negative force, and both positions have been demonstrated today and throughout history. It is the biggest social and political force of the world. It unifies people and makes them stronger. It can lead to a stable economy, patriotism and even ultranationalism. But, one could argue that all these things, especially ultranationalism have had bad consequences such as crimes against humanity, fascism and clouding a nation's ability to interact properly with the rest of the world.

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my cultural heritage consists of irish, german, native american, and others.

answer; taking up arms to defend the nation;